埋地热油管道准周期运行温度研究

热油管道运行时，沿线油温受运行历史的影响。由于大气周期温度变化和管内油温的作用，管外土壤环境温度场呈准周期变化。通过对热油管道周期运行温度的计算，讨论了热油管道输油历史对周期运行温度的影响。认为热油管道出站油温变化持续时间越长，管道恢复正常运行需要的时间也越长。当管道发生事故需要确定允许停输时间时，应考虑停输前15天内管道输油参数变化的影响。

A Study on Quasi-periodic Operating Temperature for Buried Hot Oil Pipelines

The oil temperature along the buried hot oil pipelines is influenced by operating schedule. The soil temperature outside the pipelines varies as quasi-periodic law under the affection of air temperature above the ground and oil temperature in it. The formula of periodic operating temperature along it is given and the influence on periodic operating temperature by transporting schedule is discussed in this paper. According to this research results,when allowable shutdown time needs to be determined under the oil pipeline failure,it is necessary to take the variations of operating parameters in it before shutdown into account.